Alarm.



4. A diaphragm horn comprising a longitudinally movable sleeve, a handlen the sleeve, an aperture through the handle, the aperture having itsinner end countersunlr, a valve with a tapered head to lit the aperture,and a spring bearing against the valve to yieldingly hold the valveclosed and the sleeve in extended position.

5. A diaphragm horn comprising a longitudinally movable sleeve, a handleon the sleeve, an aperture through the handle, a valve that movesoutwardly to close the aperture, a spring bearing against the valve toyieldingly hold the valve shut and to hold the sleeve in extendedposition, a bar around which the sleeve slides, the bar having a boretherein, and a stem on the valve extending into the bore of the bar.

6. A diaphragm horn comprising a square bar twisted into a spiral, asleeve sliding on the bar and having a nut portion to turn the bar, thebar having a bore, a guide for the sleeve, a handle on the end of thesleeve, the handle having an aperture with a countersunk inner end, avalve having a tapered head to it the countersunk portion, a stem on thehead and extending into the bore of the bar, and a spring encircling thestem and abutting on the end of the bore and on the sleeve.

7. A diaphragm horn comprising a guide, a stem sliding in the guide, thestem having a rectangular opening, a spiral bar to lit said opening andto be rotated by the longitudinal operation of the stem, a handle on thetop of the stem, a bore in the bar, an oiling aperture giving access tothe interior of the stem, and a bearing on Which the bar rests, the barhaving an oil duct leading from the bore to said bearing.

In testimony that I claim the foregoing,

' I hereunto set my hand this 9th day of July, '1915.

LOUIS G. HARTDORN.

Witness Louis NIEBANCK.

Copies of this patent may he obtained for ve cents each, by addressingthe Onmmissioner ot Patents. Washington, D. C.

